Design, synthesis and biological evaluation of 8-(2-amino-1-hydroxyethyl)-6-hydroxy-1,4-benzoxazine-3(4H)-one derivatives as potent β2-adrenoceptor agonists
β2-adrenoceptor agonists with an 8-(2-amino-1-hydroxyethyl)-6-hydroxy-1,4-benzoxazine-3(4H)-one moiety is presented. The stimulatory effects of the compounds on human β2-adrenoceptor and β1-adrenoceptor were characterized by a cell-based assay. Their smooth muscle relaxant activities were tested on isolated guinea pig trachea. Most of the compounds were found to be potent and selectiveagonists of the β2-adrenoceptor
Transition-Metal-Free Synthesis of Indolizines from Electron-Deficient Alkenes via One-Pot Reaction Using TEMPO as an Oxidant
作者:Yu Zhang、Huayou Hu、Fei Shi、Zhaole Lu、Xiaolei Zhu、Weiqiu Kan、Xiang Wang
DOI:10.1055/s-0035-1560973
日期:——
Abstract A one-pot method for the synthesis of multisubstituted indolizines from α-halo carbonyl compounds, pyridines, and electron-deficient alkenes is reported. The oxidative dehydrogenation reaction takes place under transition-metal-free conditions using TEMPO as an oxidant. This protocol uses ready available starting materials in a convenientprocedure under mild reaction conditions. A one-pot method
One-pot synthesis of indolizine via 1,3-dipolar cycloaddition using a sub-equivalent amount of K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> as an efficient oxidant under base free conditions
作者:Chao Wang、Huayou Hu、Juanfang Xu、Weiqiu Kan
DOI:10.1039/c5ra06019b
日期:——
X = Cl or Br; EWG1, EWG2 = electron withdrow group, one-pot reaction, 29 examples, yields from moderate to high, gram scale-up potential confirmed.
X = 氯或溴;EWG1,EWG2 = 电子吸引基团,一锅法反应,29个例子,产率从中等到高,克级放大潜力得到确认。
Lithium hydroxide as base in the Wittig reaction. A simple method for olefin synthesis
A mild and practical procedure for the Wittig olefination, promoted by lithium hydroxide and triphenylbenzyl phosphonium bromide, has been set up for the synthesis of stilbenes and styrenes. The experimental conditions allow aromatic, heteroaromatic, unsaturated and saturated aliphatic aldehydes to give final products in good yields.
A Colorimetric High-Throughput Screening Method for Palladium-Catalyzed Coupling Reactions of Aryl Iodides Using a Gold Nanoparticle-Based Iodide-Selective Probe
作者:Eunhye Jung、Sudeok Kim、Yong Kim、Seong Hyeok Seo、Soo Suk Lee、Min Su Han、Sunwoo Lee
DOI:10.1002/anie.201100378
日期:2011.5.2
Catching the couplings: A general and simple screening method for palladium‐catalyzed coupling reactions of aryl iodides utilizes gold nanoparticles. This assay was successfully employed in several aminations, α‐arylation of ketones, and decarboxylative couplings. 96 samples were screened in a few minutes.